Service members, first responders and law enforcement personnel are among those who rely on a tactical breathing technique to steady their nerves and stay sharp in high-stress situations.

The gas exchange system is responsible for getting oxygen into the blood and removing carbon dioxide as a person breathes. Breathing is also called 'ventilation' and is the movement of gases into ...

Finding it hard to breathe when you lay down is medically called orthopnea. Find a list of potential causes to help narrow down your overall risk here.

If it's an adult who is unresponsive, gently shake their shoulders. Shout for help. Step 1. Check if they are breathing. Tilt the head back - is their chest moving? Look, listen and feel for breaths.